Hayes JP, Vanelzakker MB, Shin LM Emotion and cognition interactions in PTSD: a review of neurocognitive and neuroimaging studies. Front Integr Neurosci. 2012 Oct 9;6:89. doi: 10.3389/fnint.2012.00089. eCollection 2012.
Joormann J, Gotlib IH Emotion regulation in depression: relation to cognitive inhibition. Cogn Emot. 2010 Feb 1;24(2):281-98. doi: 10.1080/02699930903407948.
Kohn N, Eickhoff SB, Scheller M, Laird AR, Fox PT, Habel U Neural network of cognitive emotion regulation--an ALE meta-analysis and MACM analysis. Neuroimage. 2014 Feb 15;87:345-55. doi: 10.1016/j.neuroimage.2013.11.001. Epub 2013 Nov 9. Erratum in: Neuroimage. 2015 May 1;111():631.
Interventional studies are often prospective and are specifically tailored to evaluate direct impacts of treatment or preventive measures on disease.
Observational studies are often retrospective and are used to assess potential causation in exposure-outcome relationships and therefore influence preventive methods.
Expanded access is a means by which manufacturers make investigational new drugs available, under certain circumstances, to treat a patient(s) with a serious disease or condition who cannot participate in a controlled clinical trial.
Clinical trials are conducted in a series of steps, called phases - each phase is designed to answer a separate research question.
Phase 1: Researchers test a new drug or treatment in a small group of people for the first time to evaluate its safety, determine a safe dosage range, and identify side effects.
Phase 2: The drug or treatment is given to a larger group of people to see if it is effective and to further evaluate its safety.
Phase 3: The drug or treatment is given to large groups of people to confirm its effectiveness, monitor side effects, compare it to commonly used treatments, and collect information that will allow the drug or treatment to be used safely.
Phase 4: Studies are done after the drug or treatment has been marketed to gather information on the drug's effect in various populations and any side effects associated with long-term use.
